Status bar + minor changes

Minor changes:

Minor tweaks in how error messages are displayed.
The step size and initialization duration (of the real-time diarization pipeline) are also part of the client's config now, must conform to the backend's config, added to accurately calculate the initial delay with the real-time mode.
Removal of redundant comments in the frontend.
Equalizer starts as soon as recording starts.
The parameters are validated before initializing the stream.
README.md file advises to review config.js before using.

saharmor / whisper-playground